Product Description:

The KDA 3.1-100-3-D00-U1 spindle drive is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. It is designed for high-speed machining centers and similar motion platforms, where it converts the constant DC link from an Indramat supply module into a controlled three-phase output for an induction or synchronous spindle motor. In a typical automation cell, it receives position, torque, and velocity commands from a higher-level CNC controller and closes the drive side of the spindle axis loop. This arrangement allows the spindle to accelerate, regulate speed under varying cutting loads, and respond quickly to braking commands during machine operation.

The drive is fed by a regulated bus at 300 VDC, and its power stage is rated for a continuous phase current of 100 A so it can supply medium-frame spindle motors without derating. Command information reaches the control card through a 16-bit digital parallel interface, allowing precise speed reference updates during each controller cycle and stable transfer of control data. Thermal management relies on a mounted heat sink blower that pulls air across the fin stack. The blower is powered by an auxiliary circuit rated at 115 V/50-60 Hz, which keeps cooling separate from the drive's DC link and helps maintain airflow during dynamic operating conditions.

Operation is permitted at ambient temperatures from 5 to 45 °C, allowing installation in standard production environments without dedicated climate control. Adequate airflow is provided by forced cooling, and the unit can operate up to 1000 m above sea level, where reduced air density can lower heat transfer. The controller uses no additional interface option, which keeps the footprint compact when only the primary spindle channel and its associated feedback loop are required.